What is the deal with https://ostrich.work/ and https://github.com/erskingardner/nips/blob/new-event-for-classifieds/402.md?

The protocol is open, but the website charges money in order to publish a job ad. Is it using a special relay that has the purpose of providing a curated nice feed of ads and it only reads from that? That would be great.

nostr:npub1zuuajd7u3sx8xu92yav9jwxpr839cs0kc3q6t56vd5u9q033xmhsk6c2uc